IBM System Storage DS4000, Hardware Maintenance Manual

Page: 137 / 184

Table 50. Symptom-to-FRU index for FAStT EXP15 and FAStT EXP200 storage expansion units (continued)
Problem Indicator Action/FRU
FAStT EXP15: Unable to access
drives on one or both SCSI buses
1. Check SCSI cables and connections
2. Option switch 2 must be set to off
3.
ESM board
FAStT EXP200: Unable to access
drives on one or both SCSI buses
1. Check SCSI cables and connections
2. Check the drive SCSI ID setting
3. ESM board
4.
Ensure that option switches 1 and 5 are set to the appropriate position
(change the switch position only when the expansion unit is powered
off).
Intermittent Power Loss
1. AC power or plug
2. Power supply
3.
Midplane
Random errors
1. Midplane board
2. (For FAStT EXP15 only) Make sure option switches 1 and 2 are set to Off
Note: If you cannot find the problem using this Symptom-to-FRU Index, test the
entire system.
“Power cords,” on page 135 lists required power cords for the DS4000 storage
components discussed in this document by country and region.
Chapter 12. IBM TotalStorage FAStT EXP15 and EXP200 Storage Expansion Units
109